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TM 5-4210-220-12
Table 3-1. OPERATOR TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3a AIR OPERATED VALVE FAILS TO OPEN OR CLOSE
Step 1. Check correct switching sequence.
Carry out correct switching sequence, (see para. 2-11).
Step 2. Check air leaking from switch or valve connections.
Tighten connection.
3b VALVES LEAKING WATER/AGENT
Valves not closed.
Close valve.
4 WATER/AGENT REMAINS IN PIPING AFTER DRAIN OPENED
Check drain valve outlet.
Clean dirt/blockage from drain hole.
5 DISCHARGE HOSE WON'T DEPRESSURIZE
Check drain valve.
Clean dirt/blockage from drain hole.
6a NO FOAM DISCHARGE AT ANY NOZZLE
Step 1. Check if foam valve set to OPEN.
Set foam valve to OPEN.
Step 2. Check if foam proportioning valve (in cab or on structural panel) closed.
Set foam proportioning valve to required percentage, (see para. 2-11).
Step 3. Check if foam tank empty or content diluted.
Drain tank and/or refill tank as required.
3-6
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